package com.sky.service.impl;


import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {


    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealDishMapper setmealMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Override
    @Transactional
    public void deleteDishWithFlavor(List<Long> ids) {

        //根据id查询要删除的菜品,判断菜品中是否有起售的菜品，有就不能删除
        //查询要删除的菜品的状态
        ids.forEach(id -> {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //如果菜品为启用状态，则不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });
        //查询要删除的菜品id是否关联套餐,判断list是否为空，为空才能删除
        //查询菜品是否与套餐关联
        List<Long> list = setmealMapper.getSetmealIdsByDishIds(ids);
        //判断list是否为空，为空，才能删除菜品
        //isEmpty一个用于检查某些数据结构是否为空的方法
        if (!list.isEmpty()) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //可以删除菜品
        dishMapper.deleteBatch(ids);
        //删除菜品关联的口味菜品
        dishFlavorMapper.deleteByIdDishIds(ids);

    }
        /**
         * 新增菜品和对应的口味
         *
         * @param dishDTO
         */
        @Override
        public void saveWithFlavor (DishDTO dishDTO){

            Dish dish = new Dish();
            BeanUtils.copyProperties(dishDTO, dish);
            //向菜品表插入1条数据
            dishMapper.insert(dish);

            //获取insert语句生成主键值
            Long dishId = dish.getId();

            List<DishFlavor> flavors = dishDTO.getFlavors();
            if (flavors != null & flavors.size() > 0) {
                flavors.forEach(dishFlavor -> {
                    dishFlavor.setDishId(dishId);
                });

                //向口味表插入n条数据
                dishFlavorMapper.insertBatch(flavors);
            }

        }

        /**
         * 菜品的分页查询
         * @param dishPageQueryDTO
         * @return
         */
        @Override
        public PageResult pageQuery (DishPageQueryDTO dishPageQueryDTO){


            PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
            Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
            return new PageResult(page.getTotal(), page.getResult());

        }

        /**
         * 根据id查询菜品和对应的口味数据
         *
         * @param id
         * @return
         */
        @Override
        public DishVO getByIdWithFlavor (Long id){
            //根据id查询菜品数据
            Dish dish = dishMapper.getById(id);

            //根据菜品id查询口味数据
            List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

            //将查询到的数据封装到VO
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(dish, dishVO);

            dishVO.setFlavors(dishFlavors);

            return dishVO;
        }

        /**
         * 根据id修改菜品基本信息和对应的口味信息
         *
         * @param dishDTO
         */
        @Override
        public void updateWithFlavor (DishDTO dishDTO){
            Dish dish = new Dish();
            BeanUtils.copyProperties(dishDTO, dish);

            //修改菜品基本信息
            dishMapper.update(dish);

            //删除原有的口味数据
            dishFlavorMapper.deleteByDishId(dishDTO.getId());

            //重新插入口味数据
            List<DishFlavor> flavors = dishDTO.getFlavors();
            if (flavors != null && flavors.size() > 0) {
                flavors.forEach(dishFlavor -> {
                    dishFlavor.setDishId(dishDTO.getId());
                });
                //向口味表插入n条数据
                dishFlavorMapper.insertBatch(flavors);
            }


        }

        @Override
        public void startOrStop (Integer status, Long id){
            Dish dish = Dish.builder().status(status).id(id).build();
            dishMapper.update(dish);
        }

    /**
     * 根据分类id查询菜品
      * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getById(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();
        return dishMapper.list(dish);
    }


    /**
     * 条件查询口味和菜品
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
